<template>
  <div id="aCoursesList" class="bg-fa of">
    <!-- /课程列表 开始 -->
    <section class="container">
      <header class="comm-title">
        <h2 class="fl tac">
          <span class="c-333">全部课程</span>
        </h2>
      </header>
      <section class="c-sort-box">
        <section class="c-s-dl">
          <dl>
            <dt>
              <span class="c-999 fsize14">课程类别</span>
            </dt>
            <dd class="c-s-dl-li">
              <ul class="clearfix">
                <li>
                  <a title="全部" href="#" @click="allSubject()" :class="{active:oneIndex==-1}">全部</a>
                </li>
                <li v-for="(oneSubject,index) in subjectNestedList" :key="oneSubject.id" :class="{active:oneIndex==index}">
                  <a :title="oneSubject.title" href="#" @click="changeOneSubject(oneSubject.id,index)">{{oneSubject.title}}</a>
                </li>               
              </ul>
            </dd>
          </dl>
          <dl>
            <dt>
              <span class="c-999 fsize14"></span>
            </dt>
            <dd class="c-s-dl-li">
              <ul class="clearfix">
                <li v-for="(twoSubject,index) in subSubjectList" :key="index" :class="{active:twoIndex==index}">
                  <a :title="twoSubject.title" href="#" @click="changeTwoSubject(twoSubject.id,index)">{{twoSubject.title}}</a>
                </li>
              </ul>
            </dd>
          </dl>
          <div class="clear"></div>
        </section>
        <div class="js-wrap">
          <section class="fr">
            <span class="c-ccc">
              <i class="c-master f-fM">1</i>/
              <i class="c-666 f-fM">1</i>
            </span>
          </section>
         <section class="fl">
          <ol class="js-tap clearfix">
            <li :class="{'current bg-orange':buyCountSort!=''}">
              <a title="销量" href="javascript:void(0);" @click="searchBuyCount()">销量
              <span :class="{hide:buyCountSort==''}">↓</span>
              </a>
            </li>
            <li :class="{'current bg-orange':gmtCreateSort!=''}">
              <a title="最新" href="javascript:void(0);" @click="searchGmtCreate()">最新
              <span :class="{hide:gmtCreateSort==''}">↓</span>
              </a>
            </li>
            <li :class="{'current bg-orange':priceSort!=''}">
              <a title="价格" href="javascript:void(0);" @click="searchPrice()">价格&nbsp;
                <span :class="{hide:priceSort==''}">↓</span>
              </a>
            </li>
          </ol>
        </section>
        </div>
        <div class="mt40">
          <!-- /无数据提示 开始-->
          <section class="no-data-wrap" v-if="data.total == 0">
            <em class="icon30 no-data-ico">&nbsp;</em>
            <span class="c-666 fsize14 ml10 vam">没有相关数据，小编正在努力整理中...</span>
          </section>
          <!-- /无数据提示 结束-->
          <article class="comm-course-list" v-else>
            <ul class="of" id="bna">
              <li v-for="(course,index) in data.records" :key="index">
                <div class="cc-l-wrap">
                  <section class="course-img">
                    <img :src="course.cover" class="img-responsive" :alt="course.title">
                    <div class="cc-mask">
                      <a :href="'/course/'+course.id" title="开始学习" class="comm-btn c-btn-1">开始学习</a>
                    </div>
                  </section>
                  <h3 class="hLh30 txtOf mt10">
                    <a :href="'/course/'+course.id" :title="course.title" class="course-title fsize18 c-333">{{course.title}}</a>
                  </h3>
                  <section class="mt10 hLh20 of">
                    <span class="fr jgTag bg-green">
                      <i class="c-fff fsize12 f-fA">{{course.price==0?'免费':course.price+'￥'}}</i>
                    </span>
                    <span class="fl jgAttr c-ccc f-fA">
                      <i class="c-999 f-fA">{{course.viewCount}}人学习</i>
                      |
                      <i class="c-999 f-fA">{{course.commentCount}}条评论</i>
                    </span>
                  </section>
                </div>
              </li>
            </ul>
            <div class="clear"></div>
          </article>
        </div>
       <!-- 公共分页 开始 -->
        <div>
          <div class="paging">
            <!-- undisable这个class是否存在，取决于数据属性hasPrevious -->
            <a
              :class="{undisable: !data.hasPrevious}"
              href="#"
              title="首页"
              @click.prevent="gotoPage(1)">首</a>
            <a
              :class="{undisable: !data.hasPrevious}"
              href="#"
              title="前一页"
              @click.prevent="gotoPage(data.current-1)">&lt;</a>
            <a
              v-for="page in data.pages"
              :key="page"
              :class="{current: data.current == page, undisable: data.current == page}"
              :title="'第'+page+'页'"
              href="#"
              @click.prevent="gotoPage(page)">{{ page }}</a>
            <a
              :class="{undisable: !data.hasNext}"
              href="#"
              title="后一页"
              @click.prevent="gotoPage(data.current+1)">&gt;</a>
            <a
              :class="{undisable: !data.hasNext}"
              href="#"
              title="末页"
              @click.prevent="gotoPage(data.pages)">末</a>
            <div class="clear"/>
          </div>
        </div>
        <!-- 公共分页 结束 -->
      </section>
    </section>
    <!-- /课程列表 结束 -->
  </div>
</template>
<script>
import courseApi from '@/api/course'
export default {
  data(){
    return {
      page:1,
      data:{},
      subjectNestedList: [], // 一级分类列表
      subSubjectList: [], // 二级分类列表
      searchObj: {}, // 查询表单对象


      oneIndex:-1,
      twoIndex:-1,
      buyCountSort:"",
      gmtCreateSort:"",
      priceSort:""
    }
  },
  created(){
    this.gotoPage(this.page)
    this.initSubject()
  },
  methods:{
    // 一级分类联动二级分类
    changeOneSubject(subjectParentId,index){
      if(this.searchObj.subjectParentId && 
      this.searchObj.subjectParentId ==subjectParentId){
        this.allSubject()
        return
      }
      this.searchObj.subjectId = ''
      this.searchObj.subjectParentId = subjectParentId
      this.oneIndex = index
      this.twoIndex = -1
      this.gotoPage(1)
      let subjectNestedList = this.subjectNestedList
      for(let i = 0;i<subjectNestedList.length;i++){
        
        if(subjectNestedList[i].id==subjectParentId){

          this.subSubjectList = subjectNestedList[i].children
        }
      }
    },
    // 二级分类条件查询
    changeTwoSubject(subjectId,index){

      if(this.searchObj.subjectId){
        this.searchObj.subjectId = ''
        this.gotoPage(1)
        this.twoIndex = -1
        // this.subSubjectList = []
        return
      }
      this.twoIndex = index
      this.searchObj.subjectId = subjectId
      this.gotoPage(1)
    },
    initSubject(){
      courseApi.getSubjectList()
        .then(response =>{
          this.subjectNestedList = response.data.data.list
        })
    },
    // 课程分页
    gotoPage(page){
      if(page>this.data.pages){
        page = 1
      }
      courseApi.getCourseListConditional(page,8,this.searchObj)
        .then(response =>{
          this.data = response.data.data.data
      })
    },
    // 展示所有的课程
    allSubject(){
      // 当前查询条件置空
      this.searchObj = {}

      this.gotoPage(1)
      this.oneIndex = -1
      this.twoIndex = -1
      this.subSubjectList = []
    },
    // 以购买数量排序
    searchBuyCount(){
      if(this.buyCountSort){
        this.buyCountSort = ''
      }else{
        this.buyCountSort = '1'
      }
      this.gmtCreateSort = ""
      this.priceSort = ""
      this.searchObj.buyCountSort = this.buyCountSort;
      this.searchObj.gmtCreateSort = this.gmtCreateSort;
      this.searchObj.priceSort = this.priceSort;
      this.gotoPage(1)
    },
    // 根据创建时间进行排序
    searchGmtCreate(){
      if(this.gmtCreateSort){
        this.gmtCreateSort = ''
      }else{
        this.gmtCreateSort = '1'
      }
      this.buyCountSort = ''
      this.priceSort = ""
      this.searchObj.buyCountSort = this.buyCountSort;
      this.searchObj.gmtCreateSort = this.gmtCreateSort;
      this.searchObj.priceSort = this.priceSort;
      this.gotoPage(1)
    },
    // 根据价格进行排序
    searchPrice(){
      if(this.priceSort){
        this.priceSort = ""
      }else{
        this.priceSort = '1'
      }
      this.gmtCreateSort = ''
      this.buyCountSort = ''
      this.searchObj.buyCountSort = this.buyCountSort;
      this.searchObj.gmtCreateSort = this.gmtCreateSort;
      this.searchObj.priceSort = this.priceSort;
      this.gotoPage(1)
    }
  }
};
</script>
<style scoped>
  .active {
    background: #bdbdbd;
  }
  .hide {
    display: none;
  }
  .show {
    display: block;
  }
</style>